Which is the amplitude of the graph of the sinusoid given by y=3sin(5x)?

Peak amplitude is 3.
Because the sinus function is cyclic sin(x) and sin(5x) can be treated the same (the 5 only shifts the x position of the peak, not it's magnitude).
sin(x) is always between -1 and 1, so the maximum is 1. The maximum is the peak, and because it is multiplied by 3, the peak amplitude is 3.

The year before the 10s so it was like when caveman were alive

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